| Products > Test Equipment |
| Siglent SDS1104X-E DC offset thermal drift |
| (1/5) > >> |
| nixz:
Hi Guys, I noticed that channels 1, 2 & 3 on my Siglent SDS1104X-E behaves at least strange. When powered on everything to work +/-OK, but after few minutes DC offset of channels 1-3 start to rise from ~0mV to more than 2mV, which makes traces to render out of the screen (500uV/div, AC coupling, nothing connected)! It is interesting that with DC coupling enabled traces are off zero, but not as much as when AC coupling is enabled, also adding 50ohm termination in DC mode influences channel offset (it starts to be positive instead of negative). Interesting thing is that channel 4 i almost OK, drifts only a bit over time and DC is at almost same level as AC... Everything was disconnected from BNC inputs; self-calibration was done several times (and had no impact on channel offsets). I've attached 2 images of channel 1&3 in AC coupling taken 25 sec. and 4:40 after power on. Do you have same issue, any clue how to fix it? Or this is "standard feature" for Siglent SDS1104X-E... best regards Mikolaj |
| BillyO:
I had something similar. Could not get rid of it by doing the built in calibration. I had to send it back to Siglent. Still not perfect, but much better. Now, wouldn't it be VERY handy to just have a control called, oh.., let's say .. "Offset" where you could just adjust that out? Hmm? |
| nixz:
--- Quote from: BillyO on December 15, 2022, 02:31:17 pm ---I had something similar. Could not get rid of it by doing the built in calibration. I had to send it back to Siglent. Still not perfect, but much better. Now, wouldn't it be VERY handy to just have a control called, oh.., let's say .. "Offset" where you could just adjust that out? Hmm? --- End quote --- Agree: if this is matter of poor factory calibration and thermal drift it shall be redesigned or at least included in self-cal and/or manual offset setting (which currently works the same as position knob). I hoped there is a hole which will fit my screwdriver and I will do offset trim myself... regards Mikolaj |
| pope:
I'm trying to replicate what you describe and the scope has been running for over 15 minutes. Hope this helps :-+ |
| nixz:
--- Quote from: pope on December 15, 2022, 03:37:01 pm ---I'm trying to replicate what you describe and the scope has been running for over 15 minutes. Hope this helps :-+ --- End quote --- Thanks, your traces look almost perfect, at least all of them are within visible area and near zero :) Probably I have to use warranty to recalibrate my scope. I hope that this is not due to some faulty batch... |
| Navigation |
| Message Index |
| Next page |